Block copolymer thin films on silicon substrates and liquid films confined between two sapphire crystals have been studied with x-ray scattering methods in order to determine their microscopic and mesoscopic structure. The block copolymers were investigated depending on the chemical composition, the film thickness and the temperature. Very interesting results could be obtained concerning an ordering of the molecules and a forming of micrometer sized holes at the surface. First experiments on confined liquids using a specially built setup have been performed. A short description of the cell, the diffractometer and the first results is given.